community-service/app/Models/MemberFollowTopic.php

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019-06-15
 * Time: 14:54
 */
namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class MemberFollowTopic extends Model{
    protected $table = 'member_follow_topic';
    protected $guarded = [];

    public function topic()
    {
        return $this->hasOne('App\Models\Topic', 'id', 'topic_id');
    }
}